21121111222 has 8 divisors (see below), whose sum is σ = 32154527736. Its totient is φ = 10402935312.

The previous prime is 21121111153. The next prime is 21121111279. The reversal of 21121111222 is 22211112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21121111222² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21121111196 and 21121111205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78809983 + ... + 78810250.

It is an arithmetic number, because the mean of its divisors is an integer number (4019315967).

Almost surely, 2^21121111222 is an apocalyptic number.

21121111222 is a deficient number, since it is larger than the sum of its proper divisors (11033416514).

21121111222 is a wasteful number, since it uses less digits than its factorization.

21121111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157620302.

The product of its digits is 32, while the sum is 16.

Adding to 21121111222 its reverse (22211112112), we get a palindrome (43332223334).

The spelling of 21121111222 in words is "twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-two".